.container {
    width: 700px;
    height: 390px;
    margin: 0 auto;
    /*  帮助absoulte定位  */
    position: relative;
}


.imgs {
    width: 100%;
    height: 100%;
}


.imgs img {
    width: 100%;
    height: 390px;
}

.imgs div {
    display:none;
}

.imgs .first {
    display: block;
}

.but1 {
    position: absolute;
    left:0;
    top: 50%;
    transform: translateY(-50%);
    color: white;
    height: 65px;
    width: 35px;
    font-weight: bold;
    font-size: 25px;
    line-height: 65px;
    text-align: center;
}

.but1:hover {
    background-color: white;
    color: black;
    cursor: pointer;
    opacity:0.5
}


.but2 {
    position: absolute;
    right:0;
    top: 50%;
    transform: translateY(-50%);
    color: white;
    height: 65px;
    width: 35px;
    font-weight: bold;
    font-size: 25px;
    line-height: 65px;
    text-align: center;
}

.but2:hover {
    background-color: white;
    color: black;
    cursor: pointer;
    opacity:0.5
}

.select {
    position: absolute;
    right: 10px;
    bottom: 10px;
}

.select li {
    float: left;
    width: 25px;
    height: 25px;
    background-color: white;
    opacity:0.8;
    margin-right: 5px;
    cursor: pointer;
    border-radius: 50%;
    list-style-type: none
}

